Question about 1999 Mercury Sable

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Heater stop working

Heater doesnt work

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Check you other question. I just posted this.

Make sure the coolant level is full in the reservoir.

If the coolant level is good feel the hoses that go to the heater core back by the firewall. If one is cold and one is hot that the heater core is plugged. I have had fairly good success back flushing the heater cores and getting them to work. If back flushing does not work than the heater core will need to be replaced. The entire dash will need to be removed to do this.

If both the hoses are hot than it may be the blend door actuator. You should hear a distinct difference in the air flow from the vents by moving the heat control from full hot to full cold.

The last thing is the t-stat could be stuck open. If this where the case than the temp gauge will also be reading low.

Check those out and let me know what you find.

Posted on Feb 14, 2012

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